13.5乘9.9加6.5乘10.1等于?_数学解答

13.5乘9.9加6.5乘10.1等于?

人气：161 ℃　时间：2020-06-04 08:28:22

解答

13.5*9.9+6.5*10.1
=13.5*(10-0.1)+6.5*(10+0.1)
=(13.5+6.5)*10+0.1(6.5-13.5)
=200-0.7
=199.3